Connected: An Internet Encyclopedia
RFC 1122 - 2.4 LINK/INTERNET LAYER INTERFACE

Top: Connected: An Internet Encyclopedia
Up: Requests For Comments
Up: RFC 1122
Up: 2. LINK LAYER
Prev: 2.3.3 Ethernet and IEEE 802 Encapsulation
Next: 2.5 LINK LAYER REQUIREMENTS SUMMARY

### 2.4 LINK/INTERNET LAYER INTERFACE

The packet receive interface between the IP layer and the link layer MUST include a flag to indicate whether the incoming packet was addressed to a link-layer broadcast address.

DISCUSSION

  Although the IP layer does not generally know link layer addresses (since every different network medium typically has a different address format), the broadcast address on a broadcast-capable medium is an important special case. See Section 3.2.2, especially the DISCUSSION concerning broadcast storms.

The packet send interface between the IP and link layers MUST include the 5-bit TOS field (see Section 3.2.1.6).

The link layer MUST NOT report a Destination Unreachable error to IP solely because there is no ARP cache entry for a destination.

Next: 2.5 LINK LAYER REQUIREMENTS SUMMARY

Connected: An Internet Encyclopedia
RFC 1122 - 2.4 LINK/INTERNET LAYER INTERFACE